I have had a dull ache in my left ovary, period was 5 days late, it started heavy (normal) but then stopped in the evening. What is wrong?

Pelvic pain. Pelvic pain is complex as there are several organs in the pelvis. The ovaries, fallopian tubes, uterus, cervix, bladder, appendix, intestines, colon and rectum can all be the source. Pelvic pain requires and examination to help organize the evaluation.